Clock



FIG. 1 is a front elevational view of a clock showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof, the right side being substantially a mirror image thereto;

FIG. 4 is a partial sectional view thereof as taken from line 4--4 of FIG. 2. 

The ornamental design for a clock, substantially as shown and described. 